Chapter 9.1
What is the radius of a circular lid with a diameter of 5 centimeters?
2.5 cm
Find the area of the circle. Use 3.14 or 22 — 7 for 𝛑.
about 50.24 in 2
Find the perimeter and the area of the fi gure.
about 33.7 in
about 79.252
Name a pair of adjacent angles.
<VUW and <WUZ
Th e radius of a circle is 25 millimeters. Find the diameter.
50mm
Find the area of the circle. Use 3.14 or 22 — 7 for 𝛑.
about 1386 mm 2
Find the perimeter and the area of the fi gure.
about 21.7 ft
about 31.63 ft 2
Name a pair of supplementary angles.
<YUZ and <ZUW
Find the circumference of the object. Use 3.14 or 22 — 7 for 𝛑.
about 37.68
A desktop is shaped like a semicircle with a diameter of 28 inches. What is the area of the desktop?
about 308 in 2
You want to fence part of a yard to make a vegetable garden. How many feet of fencing do you need to surround the garden?
60 ft
Classify the pair of angles. Then find the value of x
complementary 21
Find the circumference of the object. Use 3.14 or 22 — 7 for 𝛑.
about 4.71
An ecologist is studying an algal bloom that has formed on the entire surface of a circular pond. What is the area of the surface of the pond covered by the algal bloom?
about 615.44 ft 2
Find (a) the perimeter and (b) the area of the fi gure. Use 3.14 or 22 — 7 for 𝛑.
about 7.71 ft
about 3.53 ft 2
Classify the pair of angles. Then find the value of x
vertical 81
Estimate the radius of the Big Ben clock face in London.
about 7 m
A knitted pot holder is shaped like a circle. Its radius is 3.5 inches. What is its area? Learning Target: Find the area of a circle.
about 38.465 in 2
Find (a) the circumference and (b) the area of the circle. Use 3.14 or 22 — 7 for 𝛑.
about 6.29 m
about 3.14 m 2
Classify the pair of angles. Then find the value of x
supplementary 34