Question

Name the following types of triangles:
a)Triangle with length 9m, 9m, 9m
b)Triangle with length 6m, 6m, 9m
c) Triangle with angles 40${}^{\circ }$, 60${}^{\circ }$,80${}^{\circ }$
d)Triangle with angles 90${}^{\circ }$, 40${}^{\circ }$, 50${}^{\circ }$
e)Triangle with angles 110${}^{\circ }$, 10${}^{\circ }$, 60${}^{\circ }$
f)Tiangle with angles 70${}^{\circ }$, 70${}^{\circ }$, 40${}^{\circ }$
[4 MARKS]

Answer 1

Each Point: $/frac23$ Marks

a) The length of all sides of the triangle is equal.
So it is an equilateral triangle.
b) In this triangle two sides are=6m
So it is an isosceles triangle.
c) In this triangle, all the angles are less than 90${}^{\circ }$, So it is an acute-angled triangle.
d) In this triangle one of the angles is 90${}^{\circ }$, so the triangle is a right-angled triangle.
e) In this triangle, one of the angles is 110${}^{\circ }$. So the given triangle is an obtuse angled triangle.
f) In this triangle, two angles are equal to 70${}^{\circ }$.So it is an isosceles triangle.