tolong jawab no 11,12,13,14,15 pakai cara tolong terima kasih

11. Cari PS dengan Phytagoras
PS=✓PQ^2 - QS^2
= ✓13^2 - 5^2
= ✓144
=12
Luas = (a x t)/2
= (15 x 12)/2
= 90cm2 12. Gunakan Phytagoras CE = ✓AC^2 - AE^2 = ✓18^2 - 14^2 = ✓128 CB = ✓CE^2 + BE^2 = ✓(✓128)^2 + 6^2 = ✓128+36 =✓164 cm 13. AD = DC jadi sudut ADC = sudut ACD = 70° Sudut AOC = 2 x sudut ADC = 2 x 70° = 140° 14. Sudut QOR = (busur QR x sudut POQ)/busur PQ = (23,4 x 40)/26 = 36° 15. Gambar ABCD adl belah ketupat jadi sudut DAB = sudut BCD = 100° Sudut BCE = 180° - 100° = 80°