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a² + b² = c²
4² + b² = 5²
16 + b² = 25
25 - 16 = b²
25 - 16 = 9
√9 = 3
tingginya = 3 cm
rumus mencari luas :
L = (a+b) × tinggi : 2
= (10+18) ×3 : 2
= 28 × 3 : 2
= 14 × 3
= 52 cm²
semoga bermanfaat :D