book Maths Puzzle Numerical Ability

y=4-(x-2)^2

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book Other Question

It is possible for a triangle to be which of the following?

A) both isosceles and right
B) both equilateral and equiangular
C) both scalene and acute
D) both obtuse and equilateral
Please help me with this.

Find the perimeter of the triangle if the three sides are:
4, sqrt 5 - sqrt 5, sqrt 5 + sqrt 5

Thanks