Geometry: Circles & Semicircles – Advanced Problems (Level 4)

Hard problems involving multi-step calculations of area, circumference, and perimeter of circles and semicircles.

100 XP

Reward

20

Questions

5–10 min

Time

Q1 Question 1 of 20

A semicircle has radius 12 cm. Find the perimeter of the semicircle and add 10 cm to it.

56.56 cm 57.56 cm 58.56 cm 59.56 cm

Q2 Question 2 of 20

The diameter of a circle is 20 cm. Find its area and subtract 50 cm².

560 cm² 565 cm² 570 cm² 575 cm²

Q3 Question 3 of 20

A circle has radius 15 cm. Find its circumference and divide it by 2.

46.1 cm 47.1 cm 48.1 cm 49.1 cm

Q4 Question 4 of 20

A semicircle has radius 10 cm. Find the area and multiply it by 3.

468 cm² 470 cm² 471 cm² 475 cm²

Q5 Question 5 of 20

A circle has radius 7 cm. Its area is increased by 50%. What is the new area?

230 cm² 231.51 cm² 232 cm² 235 cm²

Q6 Question 6 of 20

Find the perimeter of a semicircle with radius 9 cm and add the diameter.

50.26 cm 51.26 cm 52.26 cm 53.26 cm

Q7 Question 7 of 20

The radius of a circle is 18 cm. Find the circumference and subtract 20 cm.

90.52 cm 91.52 cm 92.52 cm 93.52 cm

Q8 Question 8 of 20

A semicircle has diameter 14 cm. Find its area and double it.

150 cm² 153.86 cm² 155 cm² 160 cm²

Q9 Question 9 of 20

A circle has diameter 22 cm. Find its area and subtract the area of a circle with radius 5 cm.

340.34 cm² 341.34 cm² 342.34 cm² 343.34 cm²

Q10 Question 10 of 20

Find the perimeter of a semicircle with radius 11 cm and add 15 cm.

49.54 cm 50.54 cm 51.54 cm 52.54 cm

Q11 Question 11 of 20

The radius of a circle is 20 cm. Find its area and divide it by 4.

310 cm² 314 cm² 316 cm² 320 cm²

Q12 Question 12 of 20

A semicircle has radius 8 cm. Find the area and add 50 cm².

148.12 cm² 150.12 cm² 152.12 cm² 155.12 cm²

Q13 Question 13 of 20

The diameter of a circle is 30 cm. Find the circumference and divide it by 3.

30 cm 31.4 cm 32 cm 33 cm

Q14 Question 14 of 20

A semicircle has radius 6 cm. Find the perimeter and multiply it by 2.

57.04 cm 58.04 cm 59.04 cm 60.04 cm

Q15 Question 15 of 20

Find the area of a circle with radius 13 cm and subtract 50 cm².

480.66 cm² 481.66 cm² 482.66 cm² 483.66 cm²

Q16 Question 16 of 20

A semicircle has diameter 18 cm. Find its perimeter and subtract 10 cm.

46.26 cm 47.26 cm 48.26 cm 49.26 cm

Q17 Question 17 of 20

A circle has radius 16 cm. Find its area and divide it by 8.

98 cm² 100.48 cm² 102 cm² 104 cm²

Q18 Question 18 of 20

Find the perimeter of a semicircle with radius 14 cm and add the diameter.

69.96 cm 70.96 cm 71.96 cm 72.96 cm

Q19 Question 19 of 20

The diameter of a circle is 28 cm. Find the area and multiply it by 0.5.

610 cm² 615.44 cm² 620 cm² 625 cm²

Q20 Question 20 of 20

A semicircle has radius 12 cm. Find the area and add 20 cm².

250 cm² 251.36 cm² 252 cm² 255 cm²

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