A) 4+10+8= B) 5-9+1= C) -8-2+3= D) -15+8-7= E) 24+6-12= F) 18-3-21=
2 answers:
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Answer:
31.7 cm²
Step-by-step explanation:
The area (A) of the triangle is calculated as
A = absinC
where a, b are the 2 sides given and C the angle between them
∠ C = 180° - (72 + 59)° = 180° - 131° = 49° , thus
A = 0.5 × 12 × 7 × sin49° ≈ 31.7 cm² ( to 1 dec. place )