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= 40 dm + 2 (1/2 × 22/7 × 20)
= 40 dm + 62,8
= 102,8 dm
15. L persegi - L O
(14×14) - (22/7 × 7 × 7)
196 - 154 = 42 cm2
17. ACD = 50 derajat
BDC = 40 derajat
DEC = 180 - (50 + 40)
= 180 - 90
= 90 derajat
BEC berpelurus dengan DEC
BEC = 180 - 90 = 90 derajat