find the area of a triangle two sides which are of 18cm and 10cm and the perimeter is 42 cm
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Step-by-step explanation:
Perimeter of a triangle = Sum of three sides = 42cm.
Let the length of the third side xcm.
18cm. + 10cm. + xcm. = 42cm.
28cm.+xcm. = 42cm.
xcm. = 14cm.
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