4. The perimeter of A ABC is 50 cm. Its sides AB, BC and AC are respective,
15 cm, 10 cm and (x + 4) em. Find the value of x ?
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Answer:
perimeter of ∆= sum of all sides
sum of all sides=50cm
15+10+(x+4)=50
25+(x+4)=50
29+x=50
x=50-29
x=21
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