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