Jawabanmu

2014-03-19T17:27:07+07:00
L arsir = 90/360 × 22/7 × 70 cm × 70 cm - 1/2 × 70 cm × 70 cm
= 3850 cm² - 2450 cm²
= 1.400 cm²
2014-03-19T17:47:00+07:00