circumference of a circle

C = pid

C = pi2r

area of a rectangle

A = lw

perimeter of a rectangle

P = 2l + 2w

area of a trapezoid

h(b_{1} + b_{2})

A = ---------------------

2

area of a triangle

A = 1/2bh

perimeter of a square

P = 4s

surface area of a cube

SA = 6e^{2}

area of a parallelogram

A = bh

area of a square

A = s^{2}

area of a circle

A = pir^{2}

find the area of a square having 1.6-in. sides

A = s^{2}

A = 1.6^{2}

A = 2.56 sq. in.

find the perimeter of an equilateral triangle having 4 ft. sides.

P = 3s

P = 3 * 4

P = 12 ft.

find the circumference of a circle having a 3 in. radius

C = pi2r

C = 3.14 * 2 * 3

C = 18.84 in.

find the area of a rectangle with a length of 12 in. and a width of 10 in.

A = lw

A = 12 * 10

A = 120 sq. in.

find the perimeter of a rectangle that is 15 in. x 24 in.

P = 2l + 2w

P = 2(24) + 2(15)

P = 48 + 30

P = 78 in.

find the surface area of a cube that has 5 ft. edges

SA = 6e^{2}

SA = 6 * 5^{2}

SA = 6 * 25

SA = 150 sq. ft.

find the lateral surface area of a rectangular prism that is 18 ft. x 15 ft. x 8 ft.

LA = 2wh + 2lh

LA = 2(15)(8) + 2(18)(8)

LA = 240 + 288

LA = 528 sq. ft.

find the area of a circle if the radius is 5 inches.

A = pir^{2}

A = 3.14 (5^{2})

A = 3.14 (25)

A = 78.5 sq. in.

find the area of a parallelogram with a base of 25 in. and a height of 13 in.

A = bh

A = 25 * 13

A = 325 sq. in.

find the area of a triangle that has a 6 ft. height and a 9 ft. base

A = 1/2bh

A = 1/2 * 9 * 6

A = 27 sq. ft.

construct a right triangle with 3/4 in. and 1 1/2 in. legs

draw triangle

construct a triangle with 60^{o} and 40^{o} angles and an included side of 1 inch.

draw triangle

construct a triangle with 1 1/2 in, 1 in, and 1 1/4 in. sides

draw triangle

construct a triangle with 1 in, and 1 1/2 in. sides and an included angle of 50^{o}

draw triangle

construct an angle congruent to the given angle

draw

construct a line parallel to AB

draw

T or F: Isosceles triangles have no equal sides

false

T or F: The number pi is irrational.

True

T or F: If a triangle is equilateral, it is equiangular.

true

T or F: A scalene triangle has two equal sides

False

T or F; Similar triangles have the same size and shape

false

T or F: there are 180^{o} in the angles of a triangle

true

an acute triangle has three acute angles

true

T or F: an obtuse triangle has two obtuse angles and one acute angle

false