izzytickel1
izzytickel1
12-08-2017
Mathematics
contestada
Work out the value of A?
Respuesta :
deepak20273oukrdq
deepak20273oukrdq
12-08-2017
Area of triangle is 435 sq cm.
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koziadam
koziadam
12-08-2017
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.
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