segitiga PQR siku-siku di R dengan perbandingan PR dibanding gr sama dengan 3 banding 4 dan panjang PQ = 50 cm Hitunglah panjang PR dan QR

PQ^2 = PR^2 + QR^2
50^2 = (3x)^2 + (4x)^2
2500 = 9x^2 + 16x^2
2500 = 25x^2
2500/25 = x^2
100 = x^2
(100)^1/2 = x
10 cm = x

PR = 3x = 3(10) = 30 cm

QR = 4x = 4(10) = 40 cm

Keliling
= PQ + PR + QR
= 50 cm + 30 cm + 40 cm
= 120 cm

Luas
= 1/2 × a × t
= 1/2 × QR × PR
= 1/2 × 40 cm × 30 cm
= 20 cm × 30 cm
= 600 cm^2

semoga membantu