Tolong dong kak ,,,,

Jawab:

B. 24 cm

Penjelasan dengan langkah-langkah:

Tinggi Δ adalah RS.

PQ = 42 cm

PS = x cm

QS = (42 – x) cm

RS² = QR² – QS²

RS² = PR² – PS²

QR² – QS² = PR² – PS²

40² – (42 – x)² = 26² – x²

1.600 – (1.764 – 84x + x²) = 676 – x²

1.600 – 676 – 1.764 + 84x – x² + x² = 0

84x – 840 = 0

84x = 840

x = 10 cm

RS² = PR² – PS²

RS² = 26² – 10²

RS² = 676 – 100

RS² = 576

RS = √576

RS = 24 cm (B)