Practice (54)

1452

Circles

$A, B,$ and

$C$ each have radius 1. Circles

$A$ and

$B$ share one point of tangency. Circle

$C$ has a point of tangency with the midpoint of

$\overline{AB}$ . What is the area inside Circle

$C$ but outside circle

$A$ and circle

$B$ ?

1479

Rhombus

$ABCD$ has side length

$2$ and

$\angle B = 120^\circ$ . Region

$R$ consists of all points inside the rhombus that are closer to vertex

$B$ than any of the other three vertices. What is the area of

$R$ ?

1503

Equiangular hexagon

$ABCDEF$ has side lengths

$AB=CD=EF=1$ and

$BC=DE=FA=r$ . The area of

$\triangle ACE$ is

$70\%$ of the area of the hexagon. What is the sum of all possible values of

$r$ ?

1525

A square of side length

$1$ and a circle of radius

$\dfrac{\sqrt{3}}{3}$ share the same center. What is the area inside the circle, but outside the square?

1529

Two circles lie outside regular hexagon

$ABCDEF$ . The first is tangent to

$\overline{AB}$ , and the second is tangent to

$\overline{DE}$ . Both are tangent to lines

$BC$ and

$FA$ . What is the ratio of the area of the second circle to that of the first circle?

1555

Many Gothic cathedrals have windows with portions containing a ring of congruent circles that are circumscribed by a larger circle, In the figure shown, the number of smaller circles is four. What is the ratio of the sum of the areas of the four smaller circles to the area of the larger

1557

Convex quadrilateral

$ABCD$ has

$AB = 9$ and

$CD = 12$ . Diagonals

$AC$ and

$BD$ intersect at

$E$ ,

$AC = 14$ , and

$\triangle AED$ and

$\triangle BEC$ have equal areas. What is

$AE$ ?

1563

A rectangular yard contains two flower beds in the shape of congruent isosceles right triangles. The remainder of the yard has a trapezoidal shape, as shown. The parallel sides of the trapezoid have lengths

$15$ and

$25$ meters. What fraction of the yard is occupied by the flower

1577

Rectangle

$ABCD$ has

$AB=8$ and

$BC=6$ . Point

$M$ is the midpoint of diagonal

$\overline{AC}$ , and

$E$ is on

$AB$ with

$\overline{ME}\perp\overline{AC}$ . What is the area of

$\triangle AME$ ?

1586

A square is drawn inside a rectangle. The ratio of the width of the rectangle to a side of the square is

$2:1$ . The ratio of the rectangle's length to its width is

$2:1$ . What percent of the rectangle's area is inside the square?

1594

Each of the sides of a square

$S_1$ with area

$16$ is bisected, and a smaller square

$S_2$ is constructed using the bisection points as vertices. The same process is carried out on

$S_2$ to construct an even smaller square

$S_3$ . What is the area of

$S_3$ ?

1600

Points

$A$ and

$B$ lie on a circle centered at

$O$ , and

$\angle AOB = 60^\circ$ . A second circle is internally tangent to the first and tangent to both

$\overline{OA}$ and

$\overline{OB}$ . What is the ratio of the area of the smaller circle to that of the larger circle?

1601

An equilateral triangle has side length

$6$ . What is the area of the region containing all points that are outside the triangle but not more than

$3$ units from a point of the triangle?

1604

Trapezoid

$ABCD$ has bases

$\overline{AB}$ and

$\overline{CD}$ and diagonals intersecting at

$K$ . Suppose that

$AB = 9$ ,

$DC = 12$ , and the area of

$\triangle AKD$ is

$24$ . What is the area of trapezoid

$ABCD$ ?

1648

A triangle with side lengths in the ratio

$3 : 4 : 5$ is inscribed in a circle with radius 3. What is the area of the triangle?

1649

Four circles of radius

$1$ are each tangent to two sides of a square and externally tangent to a circle of radius

$2$ , as shown. What is the area of the square?

1652

Consider the

$12$ -sided polygon

$ABCDEFGHIJKL$ , as shown. Each of its sides has length

$4$ , and each two consecutive sides form a right angle. Suppose that

$\overline{AG}$ and

$\overline{CH}$ meet at

$M$ . What is the area of quadrilateral

$ABCM$ ?

1653

A paint brush is swept along both diagonals of a square to produce the symmetric painted area, as shown. Half the area of the square is painted. What is the ratio of the side length of the square to the brush width?

1670

A circle passes through the three vertices of an isosceles triangle that has two sides of length

$3$ and a base of length

$2$ . What is the area of this circle?

1672

Two circles of radius

$2$ are centered at

$(2,0)$ and at

$(0,2).$ What is the area of the intersection of the interiors of the two circles?

1676

Point

$P$ is inside equilateral

$\triangle ABC$ . Points

$Q$ ,

$R$ , and

$S$ are the feet of the perpendiculars from

$P$ to

$\overline{AB}$ ,

$\overline{BC}$ , and

$\overline{CA}$ , respectively. Given that

$PQ=1$ ,

$PR=2$ , and

$PS=3$ , what is

$AB$ ?

1697

Rolly wishes to secure his dog with an 8-foot rope to a square shed that is 16 feet on each side. His preliminary drawings are shown.

Which of these arrangements give the dog the greater area to roam, and by how many square feet?

1701

A circle of radius 1 is tangent to a circle of radius 2. The sides of

$\triangle ABC$ are tangent to the circles as shown, and the sides

$\overline{AB}$ and

$\overline{AC}$ are congruent. What is the area of

$\triangle ABC$ ?

1702

In rectangle

$ADEH$ , points

$B$ and

$C$ trisect

$\overline{AD}$ , and points

$G$ and

$F$ trisect

$\overline{HE}$ . In addition,

$AH=AC=2$ . What is the area of quadrilateral

$WXYZ$ shown in the figure?

1714

Circles of diameter 1 inch and 3 inches have the same center. The smaller circle is painted red, and the portion outside the smaller circle and inside the larger circle is painted blue. What is the ratio of the blue-painted area to the red-painted area?

PlaneGeometry Triangle PythagoreanTheorem AreaMethod SpecialValueMethod

AMC10/12

With Solutions

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