Tolong bantu ya 2 pertanyaan itu mksh :)
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1. a + (n-1) x b + c/2 x (n-1) x (n-2)
= 1 + (8-1) x 2 + 1/2 x (8-1) x (8-2)
= 1 + 7 x 2 + 1/2 x (7) x (6)
= 15 + 1/2 x 42
= 15 + 21
= 36 (C.)
2.
KAL + LBM =
38° + 24° =
62°
Besar AOB adalah 62°
berarti, KLM = 2x AOB
= 2 x 62°
= 124° (C.)
MOHON MAAF KALO SALAH