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Which expression can be used to find the area of triangle RST?

(8 ∙ 4) - (10 + 12 + 16)

(8 ∙ 4) - (10 + 12 + 16)

(8 ∙ 4) - (5 + 6 + 8)

(8 ∙ 4) - (5 - 6 - 8)

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Answers (2)
  1. 4 May, 08:30
    0
    We start by drawing a rectangle around the triangle as shown in the diagram below Area of RST = Area of rectangle - (area of triangle A + area of triangle B + area of triangle C) Area of RST = (8*4) - [ (1/2*8*2) + (1/2*4*3) + (1/2*5*2) ] ⇒ we factorise the 1/2 out of the expression for the area of triangle A, B, and C Area of RST = (8*4) - 1/2 (16+12+10)
  2. 4 May, 08:32
    0
    (8 ∙ 4) - 1/2 (10 + 12 + 16) or A is the answer.
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