Question

plzz solve it stepwise

Answer 1

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Q 87.
The correct option will be a.
We know that the sum of two sides of a traingle should always be greater than the third side.
We will assume one side having 1 cm, with the other sides having x and y cm length respectively.
So, x+y+1=12
x+y=11
One of the pair of numbers which satisfy this equation is (5,6).
But 5+1=6, so the sum of two sides here is not greater than the third side. This is why 1 cannot be the length of the triangle.

Q 88.
The correct option will be d.
Lets imagine a square in our mind, with a little compass (The north south one).
Vector a points south. Vector b will start from Vector a's arrow head and point west. Vector c will start from vector b's arrow head and point north. Vector d will start from vector c's arrow head and point east.
Try drawing it on paper. You'll understand.
Vector a and Vector c have opposite directions. So vector a = - vector c.

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