Triangle and Its Types

Write the properties of obtuse angle triangle.

In a $△ABC$, if $\angle A<\angle B<45°$, then $△ABC$ is a/an________________triangle

Sides of a triangle are $2 \mathrm{cm}, 3 \mathrm{cm} \& 2 \mathrm{cm}$. Find the perimeter of the triangle.

Sides of a triangle are $5 \mathrm{cm}, 12 \mathrm{cm} \& 13 \mathrm{cm}$. Find the perimeter of the triangle.

Sides of a triangle are $3 \mathrm{cm}, 4 \mathrm{cm} \& 3 \mathrm{cm}$. Find the perimeter of the triangle.

Sides of a triangle are $3 \mathrm{cm}, 3 \mathrm{cm} \& 5 \mathrm{cm}$. Find the perimeter of the triangle.

Sides of a triangle are $8 \mathrm{cm}, 8 \mathrm{cm} \& 8 \mathrm{cm}$. Find the perimeter of the triangle.

Sides of a triangle are $7 \mathrm{cm}, 5 \mathrm{cm} \& 6 \mathrm{cm}$. Find the perimeter of the triangle.

Sides of a triangle are $3 \mathrm{cm}, 4 \mathrm{cm} \& 5 \mathrm{cm}$. Find the perimeter of the triangle.

Which of the following triangles is similar to which triangle in all aspects?

Construct a triangle $ABC$ with side $\text{AC = 6 cm, ∠A = 60°, and ∠C = 45°}$.

Which of the following triangles is congruent to which triangle:

Which of the following triangles is similar to which triangle in all aspects?

Construct a triangle $\mathrm{ABC}$ in which $\mathrm{AB}=4.5$ cm, $\mathrm{BC}=6$ cm and $\angle \mathrm{C}=60°$ cm.

$16$ lines form $8$ equilateral triangles as shown in the figure.

Remove four lines from the above figure to form four equilateral triangles.

A triangle whose all the angles are of measure less than $90°$ is known as an _____ triangle. (obtuse / acute / equilateral)

In a hexagon, how many triangles are contained? (two/three/four)

In $△\mathrm{PQR}$, $\angle \mathrm{P}=36°$ and $\angle \mathrm{Q}=48°$, then which is the smallest side? $\left(\mathrm{PQ}/\mathrm{RQ}/\mathrm{PR}\right)$

If a triangle $ABC$ is an isosceles triangle, then which of the following conditions hold?

$ABCD$ is a square and $ABE$ is an equilateral triangle outside the square then