Jika luasnya 150cm2, AB:AC= 4:3. Maka keliling segitiga ABC=….cm
A. 30, B. 36, C. 45, D. 60
Diketahui segitiga ABC siku-siku di A.
Jawaban:
Luas = 1/2 × a × t
150 = 1/2 × (3x × 4x)
300 = 12x²
x = √25
x = 5
3x = 3(5) = 15 cm
4x = 4(5) = 20 cm
Sisi miring = √(15² + 20²) = √(225 + 400) = √625 = 25 cm
K = 15 cm + 20 cm + 25 cm
K = 60 cm [D]