Question

Tolong yaa secepatnya makasih

Answer 1

Nomer 1
nilai x
120 + 12x = 180
12x = 60
x = 5°
nilai y
56 + 5x + 2y = 180
56 + 5(2) + 2y = 180
56 +10 + 2y = 180
2y = 180 - 56-10
2y = 114
y = 57°
nilai z
12x + 56 + 4z = 180
12(2) + 56 + 4z = 180
24 + 57 + 4z = 180
4z = 180 -24-57
4z = 100
z = 25
maka
x + y+ z
= 2 + 57 + 25
= 84°

nomer 2
(180 - 145) + (180 - 130)
= 85°

nomer 3
luas ∆ = 1/2.x 3 x 4
luas = 6 cm²
keliling
cari sisi miringnya dulu
cb =√4²+3²
cb = 5
keliling nya = 3+4+5 = 12 cm