This math topic focuses on the area of a circle, emphasizing how to calculate it from the diameter. The students use the formula A = πr², where r is half the diameter (d/2), to solve the problems. This topic provides step-by-step guidance, hints, as well as a calculator for each problem. It forms part of an introductory unit on Geometry with a special focus on circle areas.
Work on practice problems directly here, or download the printable pdf worksheet to practice offline.
Practice:
Circle from Diameter (with hint and calculator)
Complete these online problems with 80% or 4 correct answers in a row. Results are immediate.
Find the area using the formula A = πr² and r = d/2
Area of a Circle from Diameter (with hint and calculator) Worksheet
| Math worksheet on 'Area of a Circle from Diameter (with hint and calculator) (Level 1)'. Part of a broader unit on 'Geometry - Circle Area - Intro' Learn online: app.mobius.academy/math/units/geometry_circles_area_intro/ |
1
| Find the area using the formula A = πr² and r = d/2 |
a
| 251.33 |
b
| 37.7 |
c
| 72 |
d
| 113.1 |
e
| 36 |
f
| 18.85 |
2
| Find the area using the formula A = πr² and r = d/2 |
a
| 254.47 |
b
| 15.71 |
c
| 131.95 |
d
| 175.93 |
e
| 78.54 |
f
| 50 |
3
| Find the area using the formula A = πr² and r = d/2 |
a
| 1 |
b
| 31.42 |
c
| 18.85 |
d
| 6.28 |
e
| 3.14 |
f
| 2 |
4
| Find the area using the formula A = πr² and r = d/2 |
a
| 9 |
b
| 18 |
c
| 28.27 |
d
| 75.4 |
e
| 18.85 |
f
| 9.42 |
5
| Find the area using the formula A = πr² and r = d/2 |
a
| 94.25 |
b
| 4 |
c
| 6.28 |
d
| 8 |
e
| 12.57 |
f
| 78.54 |
6
| Find the area using the formula A = πr² and r = d/2 |
a
| 50.27 |
b
| 32 |
c
| 153.94 |
d
| 16 |
e
| 25.13 |
f
| 12.57 |