If a1=7 and d=28, find a9
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Since the three angles of a triangle add to give 180°
The the size of the largest angle 4 = 180° ×
= 180° ×
∴ the size of the largest angle = 80°
The the size of the largest angle 4 = 180° ×
= 180° ×
∴ the size of the largest angle = 80°