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Masteriza [31]
4 years ago
11

Work out the value of A?

Mathematics
2 answers:
valkas [14]4 years ago
5 0
  P = s1 + s2 + s3
70 = (4x+1) + (3x) + (3x-1)
70 = 4x + 1 + 3x + 3x - 1
70 = 10x
/10   /10
  7 = x

   3x = ?
3(7) = 21
(base)

   3x - 1 = ?
3(7) - 1 = ?
  21 - 1 = 20
  (height)

A = bh / 2
   = (21)(20) / 2
   = 420 / 2
   = 210

Therefore the area is 210cm².
aalyn [17]4 years ago
3 0
Area of triangle is 435 sq cm.
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