Test 10, Unit 12 Flashcards
Formula for area of a triangle
A = 1/2bh
Formula for perimeter of a square
P = 4s
Formula for circumference of a circle using the radius
C = 2 pi r
Formula for perimeter of a rectangle
P = 2l + 2w
Formula for area of a circle
A = pi r squared
Formula for area of a trapezoid
A = h(b1 + b2) divided by 2
Formula for area of a square
A = s x s or A = s squared
Formula for area of a parallelogram
A = bh
type of angle - 90 degrees
right
type of angle - less than 90 degrees
acute
type of angle - more than 90 degrees but less than 180 degrees
obtuse
type of angle - 180 degrees
straight
type of triangle - three congruent sides
equilateral
type of triangle - only two congruent sides
isosceles
type of triangle - one right angle
right
write the number of degrees in a triangle
180
write the name of the instrument that is used to draw circles
compass
write the length of the radius in a circle if the diameter is 12 cm
6 cm
write the name of the polygon that has six sides.
hexagon
Find the perimeter of a square - s = 50 cm
P = s x 4 P = 50 x 4 P = 200 cm
Find the perimeter of a rectangle - l = 9 1/2 ft.; w = 7 ft.
P = 2l + 2w P = 19 + 14 P = 33 ft.
Find the perimeter of a parallelogram - l = 38 yd.; w = 35 yd.
P = 2(l + w) or P = 2l + 2w (same thing) P = 2 (38 + 35) P = 2 (73) P = 146 yd.
Find the area of a circle - r = 4 cm
A = pi r squared A = 3.14 x 16 A = 50.24 sq. cm
Find the area of a rectangle - l = 15.2 m; w = 12.1 m
A = lw A = 15.2 x 12.1 A = 183.92 sq. m
Find the area of a triangle - b = 8 ft.; h = 6 ft.
A = 1/2bh A = 1/2 x 48 A = 24 sq. ft.
Find the area of a square - s = 25 ft.
A = s x s A = 25 x 25 A = 625 sq. ft.
Find the area of a trapezoid - b1 = 10 in.; b2 = 8 in.; h = 6 in.
A = h(b1 + b2) divided by 2 A = 6(18) divided by 2 A = 108 / 2 A = 54 sq. in.
Find the area of a parallelogram - b = 20 ft.; h = 18 ft.
A = bh A = 20 x 18 A = 360 sq. ft.
Find the area of a circle - r = 10 m
A = pi r squared A = 3.14 x 10 x 10 A = 314 sq. m
Find the circumference. d = 8 in.
C = pid C = 3.14 x 8 C = 25.12 in.
Find the circumference. r = 10 m
C = 2pir C = 2 x 3.14 x 10 C = 62.8 m
Find the number of degrees in the 3rd angle of the triangle: 80 degrees, 22 degrees
180 - 80 - 22 =
78 degrees
Find the number of degrees in the 3rd angle of the triangle: 55 degrees, 64 degrees
180 - 55 - 64 =
61 degrees
Find the number of degrees in the 3rd angle of the triangle: 90 degrees, 30 degrees
180 - 90 - 30 =
60 degrees
Write an equation & solve.
One angle is twice another angle. The sum of the angles is 90. How many degrees are in each angle?
x + 2x = 90
3x = 90
x = 30
the two angles are 30 & 60
Write an equation & solve.
One angle has 10 degrees more than another angle. The sum of the angles is 90. How many degrees are in each angle?
x + x + 10 = 90 2x + 10 = 90 2x = 80 x = 40 the two angles are 40 & 50
