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Area of triangle is = 1/2×base×height
Given that base and height are in ratio 7:5
Then let the base be 7x cm and height be 5x cm.
Then area of triangle will be A=1/2× 7x × 5x
Given area us 70 cm so
70=1/2 × 35x^2
140 = 35x^2
Then dividing both sides by 35 we get
Now taking square root on both sides we get
So we obtain x equal to 2.
Above we have assumed base =7x
So now the base will be 7×2=14
And height was =5x
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height was 5x so niw it will be 5×2 =10 cm
that's all
Let the side be x
  given height and base are in the ratio =7:5
                   given area =70cm2
                ∴ area =1/2 b*h

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