Jawaban:

1. Sudut ber suplemen jika

dijumlahkan besar sudutnya = 180°

Diketahui :

Sudut Y = 18° lebih dr sudut X dpt

ditulis y = x + 18°

x + y = 180°

x + (28° + x) = 180°

18° + 2x = 180°

2x = 180° - 18°

2x = 162°

x = 162°/2 = 81°

sudut y = 18°+x = 18°+81 = 99°

berarti sudut x = 81° dan sudut y =

99°

2. Keliling = 2 (p+l)

p = (k : 2) - l

= (32m : 2) - 6m

= 16m - 6m

= 10m

Keliling = 2 (10m + 6m)

= 2 x 16m

= 32m

Luas = p x l

= 10m x 6m

= 60m

3. A²+B² = C²

24² + 18² = C²

576 + 324 = C²

900 = C²

C = √900

C = 30cm

keliling = sisi 1 + sisi 2 + sisi 3

keliling = 24cm + 18cm + 30cm

keliling = 72cm