1.2.1 Using Formulas in Geometry

Question 1

perimeter (P)

Answer 1

of a plane figure is the sum of the side lengths of the figure

Question 2

area (A)

Answer 2

of a plane figure is the number of nonoverlapping square units of a given size that exactly cover the figure

Question 3

base (b)

Answer 3

of a triangle can be any side of the triangle

Question 4

height (h)

Answer 4

of a triangle is a segment from a vertex that forms a right angle with a line containing the base of the triangle

Question 5

diameter

Answer 5

in a circle, a diameter is a segment that passes through the center of the circle and whose endpoints are on the circle

Question 6

radius

Answer 6

of a circle is a segment whose endpoints are the center and a point on the circle

Question 7

circumference

Answer 7

of a circle is the distance around a circle

Question 8

pi (π)

Answer 8

it is the ratio of a circle’s circumference to its diameter.

Question 9

Perimeter of a Rectangle

Answer 9

P = 2l + 2h, where l is the length and h is the height of the rectangle

Question 10

Area of a Rectangle

Answer 10

A = lh, where l is the length and h is the height of the rectangle

Question 11

Perimeter of a Triangle

Answer 11

P = a + b + c, where a, b, and c are the lengths of the sides of the triangle

Question 12

Area of a Triangle

Answer 12

A = 1/2 bh, where b is the length of the base and h is the height of the triangle

Question 13

Area of a Square

Answer 13

A = s^2, where s is the length of one side of the square.

Question 14

Circumference of a Circle

Answer 14

C = 2πr, where r is the radius of the circle

Question 15

Area of a Circle

Answer 15

A = πr2, where r is the radius of the circle