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Dik πrad=180°
Jadi 5(180°)/4
=900°/4
=225°. (D)
2.sin beta =depan /miring
Dik:depan=q,dan miring=r
Sin Beta=q/r. (B)
3.cos alpa=samping/miring
Dik: samping=15cm
Miring=20cm
Cos alpa=15/20
=0,75 (B) 4.cotan alpa=2,4 Cotan alpa=saya samping/depan=12/5=2,4 Penjelasan selanjutnya ada di foto: