Question

D,e,f are mid pts of sides of triangle abc. Ab=3cm bc=4cm ac=4cm find the perimeter of triangle def

Answer 1

Answer:

Step-by-step explanation:

For this problem you may apply the law of cosines,which is an extension of Pythagoras's Theorem. If ABC is our triangle, then:

BC^2 = AB^2 + AC^2 -[ 2*AB*AC*cos(A) ]

I used the right parantheses to avoid any confusion.

Thus we have:

BC^2 = 9 + 16 - [2*3*4*(1/2)]

BC^2 = 25 - 12

BC^2 = 13

BC = sqrt(13)

You may also use this theorem to find the angle formed by 2 sides. This image might help:

Answer 2

Step-by-step explanation:

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