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A triangle has a area of 90 cm square find the length of the base is the base is 3 more than height |
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Answer» Step-by-step explanation: let the height be X cm then, base =(x+3)cm we KNOW, area of a triangle=½bh given, ½bh=90 =½*(x+3)x=90 =x²+3x=90 =x²+3x-180=0 =x²+15x-12x-180=0 =x(x+15)-12(x-15) =0 =(x-12) (x+15)=0 therefore,x=12 or -15 |
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