semua ya kak
Nomor 1a:
(√32)² = a² + a²
32 = 2a²
a² = 32/2
a² = 16
a = √16
a = 4 cm
Nomor 1b:
a² = 72² + 72²
a² = 5.184 + 5.184
a² = 10.368
a = √10.368
a = √5.184×2
a = 72√2
Nomor 1c:
cos 30° = sisi samping/sisi miring
½√3 = b/16
√3/2 = b/16
16√3 = 2b
b = 16√3 ÷ 2
b = 8√3
Nomor 1d:
sin 30° = sisi depan/sisi miring
½ = c/17√2
2c = 17√2
c = 17√2 ÷ 2
c = 8,5√2
cos 30° = sisi samping/sisi miring
½√3 = 17√2/d
√3/√2 = 17√2/d
√3d = 17 . 2
√3d = 34
d = 34/√3
Nomor 1e:
cos 60° = sisi samping/sisi miring
½√3 = 5/a
√3/2 = 5/a
10 = a√3
a = 10/√3
sin 60° = sisi depan/sisi miring
½ = b ÷ 10/√3
½ = b√3/10
2b√3 = 10
b√3 = 10/2
b√3 = 5
b = 5/√3
Nomor 1f:
cos 60° = sisi samping/sisi miring
½√3 = d/20
√3/2 = d/20
20√3 = 2d
d = 20√3/2
d = 10√3
sin 60° = sisi depan/sisi miring
½ = e/20
2e = 20
e = 20/2
e = 10
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