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Maths CBSE Live product
Class 7 (2026-27)
A tale of three intersecting lines
Construction by Sides
7.
Construct a right angled triangle
Question:
5
m.
Construct a triangle right angled at
\(A\)
having the base
\(AB = 5.6 \ cm\)
using the set square.
Answer variants:
Construction:
Step - 1:
Draw the slanting line segment AB = 5.6 cm
Draw the base line segment AB = 5.6 cm
Draw the vertical line segment AB = 5.6 cm
.
Step - 2:
Align the ruler with the base, then place the ruler on the set square's right angle flat against it.
Align the ruler with the base, then place one leg of the set square's right angle flat against it.
Align the set square with the base, then place the ruler on the set square's right angle flat against it.
Step - 3:
Slide the set square along the ruler till the vertical edge of the set square touches the vertex \(A\).
Slide the set square along the ruler till the vertical edge of the set square touches the vertex \(B\).
Slide the set square along the ruler till the horizontal edge of the set square touches the vertex \(A\).
Step - 4:
Mark a point C along the set square and draw the altitude to AB through C using the vertical edge of the set square.
Mark a point C along the set square and draw the altitude to BC through B using the vertical edge of the set square.
Mark a point B along the set square and draw the altitude to AC through B using the vertical edge of the set square.
Step - 5:
Join AC to get the required triangle right angled at B
Join BC to get the required triangle right angled at A
Join BC to get the required triangle right angled at B
.
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