work out the total area of triangle ABC. calculate the area of AC. sides are:8.2cm and 13.5cm and angle 81 degrees
Accepted Solution
A:
Answer:54.67 cm²Step-by-step explanation:Given that the two sides of Δ ABC are 8.2 cm and 13.5 cm and the angle included by those sides is 81°.
Let, b = 8.2 cm and c = 13.5 cm and ∠ A = 81°
Hence, area of triangle ABC, Δ = [tex]\frac{1}{2} bc \sin A[/tex]
⇒ Δ = [tex]\frac{1}{2} bc \sin 81[/tex]
⇒ Δ = [tex]\frac{8.2 \times 13.5 \times \sin 81}{2}[/tex]
⇒ Δ = 54.67 cm² (Answer)