We have seen how we can draw a series of right triangles as in the picture.
How do we write in algebra, the difference in perimeter of the nth triangle to that of the triangle just before it?
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We have seen how we can draw a series of right triangles as in the picture. How mulch more is the perimeter of the 10^th triangle than the perimeter of the ninth triangle? .

We have seen how we can draw a series of right triangles as in the picture. What are the lengths of the sides of the tenth triangle? .

The picture shows an equilateral triangle cut into halves by a line through a vertex. How much less than the perimeter of the whole triangle is this? .

In the picture below, the lines parallel to each side of the blue triangle through the opposite vertex are drawn to make the big triangle. How many triangles in the picture have the same area as that of the blue triangle? How many of them have the same measures of the blue triangle?

Anup made a triangle with three sticks of length 4 centimeters each. What is the perimeter of this triangle? How do you do it?

Draw a triangle of sides 3, 4 and 6 centimeters. Draw three different right triangles of the same area.

We have seen in class 7 that any odd number can be written as the difference of two perfect squares. (The lesson identities) Using this, drawn lines of length sqrt7 and sqrt11 centimetres.

In the picture below, the lines parallel to each side of the blue triangle through the opposite vertex are drawn to make the big triangle. How many triangles in the picture have the same area as that of the blue triangle.