6. The branch of mathematics in which we study shapes, is
(A) Arithmetic
(B) Algebra
(C) Geometry
(D) Trigonometry
Answer:
(C) Geometry
Explanation:
Geometry is the branch of mathematics focused on the properties, measurements, and relationships of points, lines, angles, surfaces, and solid shapes.
7. If two angles of a triangle are 45° each, the triangle is
(A) Scalene
(B) Equilateral
(C) Isosceles
(D) None
Answer:
(C) Isosceles
Explanation:
An isosceles triangle is defined as a triangle that has at least two equal angles (and consequently, two equal side lengths). Since two angles are both , it is an isosceles triangle (specifically, a right isosceles triangle, as the third angle must be 45°
8. Half of a circle is known as
(A) Radius
(B) Cord
(C) Diameter
(D) Semi circle
Answer:
(D) Semi circle
Explanation:
In geometry, a semi-circle is exactly half of a circle, formed by cutting the whole circle along its diameter.
9. The length of a circle is called
(A) Chord
(B) Arc
(C) Diameter
(D) Circumference
Answer:
(D) Circumference
Explanation:
Mathematically, the continuous boundary “length” of a circle is its circumference. However, the length measured straight across a circle through its center is the diameter.
10. The perimeter of the circle is
(A) Chord
(B) Arc
(C) Diameter
(D) Circumference
Answer:
(D) Circumference
Explanation:
In geometry, the perimeter—the total linear distance around the outside edge of a closed circular figure—is formally called the circumference.
