In a triangle the perpendicular line drawn from the vertex to the opposite side is ________
Isosceles
Scalene
Equilateral
Right angled
The altitude or height of the triangle is a perpendicular drawn from the vertex to the opposite side
If the altitudes from two vertices of a triangle to the opposite sides are equal then the triangle is
(a) equilateral (b) isosceles
(c) scalene (d) right angled