tolong nomer 1,2,3 besok di kumpul nih

1) a. keliling = 75+15+75+15 =180 cm
b. luas = a × t = 75 × t
t² = 15²-9² = 225-81 = 144
t = √144
t = 12
maka, luas= 75 × 12 = 900 cm²

2) a. keliling = 4 × s
52 = 4 × 2x + 3
52 : 4 +3 = 2x
13 +3 = 2x
16 = 2x
x= 8 cm
b. luas = 1/2 × d1 × d2
luas= 1/2 × 2x × 4x+4
luas= 1/2 × (2×8) × (4×8+4)
luas= 1/2 × 16 × 36
luas = 8 × 36
luas = 288 cm²

3) a. LMO = 50 :2 = 25°
b. 5a = 140°
a= 140 :5
a= 28°