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