How many triangles are there in the pentagon?

Look at the regular pentagon and answer the question.

Name all the triangles.

Look at the regular pentagon and answer the questions.

Measure the angles of each triangle and verify the angle sum property.

Look at the regular pentagon and answer the question.

Measure the sides of the triangles. Compare the sum of the two sides with the third side.

Find the values of $x,y,z$ if $QR\parallel MN$.

A $17 \mathrm{m}$ long ladder reaches a window that is $8 \mathrm{m}$ above the ground on one side of a street, and from the same point it reaches a window $15 \mathrm{m}$ high on a wall on the opposite side. Width of the street$=\mathrm{\_\_\_\_\_m}$

In the given figure $PQRS$ is a square of side $8 \mathrm{cm}$. If $PT=14 \mathrm{cm}$, the length of $\mathrm{RT}=\mathrm{\_\_\_\_\_} \mathrm{cm}$.

An isosceles triangle can be a right-angled triangle.