Question

1. a triangle with all sides equal is called: *

a. isosceles
b. equilateral
c. scalene
d. right - angled

1. the sum of interior angles of a quadrilateral is: *

a. 180°
b. 270°
c. 360°
d. 540°

Explanation:

For question 3, by definition, an equilateral triangle has all - sides equal. An isosceles triangle has two equal sides, a scalene triangle has no equal sides, and a right - angled triangle is defined by having a 90 - degree angle.
For question 4, the formula to find the sum of interior angles of a polygon is $(n - 2)\times180^{\circ}$, where $n$ is the number of sides. For a quadrilateral, $n = 4$, so $(4 - 2)\times180^{\circ}=360^{\circ}$.

Answer:

1. B. Equilateral
2. C. $360^{\circ}$