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In fig. BD=10cm , AC=12cm , BC=26cm.
(a)find area of ?ABC?
(b)calculate the height of AE.

G an
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Area of triangle is 40
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..........

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1)  In DBA,.
DC = root over 262 - 102
DC = root over 676cm2 - 100cm2
DC = rootover 576cm2
DC = 24cm2
DA = (24-12)cm2
DA = 12cm2
DBC = 1/2 x 10 x 24
DBC = 120cm2
DAB = 1/2 x 10 x 12
DAB = 60cm2
120cm2 - 60cm2 = 60cm2
2) 1/2 x 26 x AE = 60cm2
AE = 60 x 2/26
AE =4 8/13cm2
 
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1st part answer is 60 cm² 2nd part answer is 4 8/13
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