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= πr² - s²
= 3,14 (14)² - (20)²
= 3,14 (196) - 400
= 615,44 - 400
= 215,44 cm²
21 x 21 = 441 cm²
b2 = πr²
22/7 x 14 x 14
= 616cm²
bt = b2 - b1 = 616 - 441
= 175cm²
3. b2 = 20 x 20 ÷ 2
= 200cm²
b1 = 3,14 x 10 x 10 ÷ 2
= 157cm²
bt = b1 + b2
= 200 + 157
= 357cm²
4. segitiga nya dijadikan persegi
b1 = 20 x 20
= 400cm²
b2= 3,14 x 10 x 10 ÷ 2
= 154cm²
bt = b1 + b2
= 400 + 154
= 554 cm²
5. dt = 14+2(3,5)
= 21
r = 10,5
lb = 22/7 x 10,5 x10,5
= 346,5 cm²
lk = 22/7 x 7 x 7
= 154cm²
luas yang diarsir = lb-lk
= 346,5 - 154
= 192,5 cm²