7th Maths : Term 2 Unit 4 : Geometry : Text Book Back Exercises Questions with Answers, Solution

**Summary**

● The sum of three angles in a triangle
is 180°.

● The exterior angle of a triangle is
equal to the sum of the two interior opposite angles.

● The exterior angles of a triangle add
up to 360º.

● Two lines segments are congruent if
they have the same length.

● Two angles are congruent if the measures
of the angles are equal.

● If the corresponding sides and corresponding
angles of two plane figures are equal then they are called congruent figures.

● If three sides of one triangle are
equal to the corresponding sides of the other triangle then
the two triangles are congruent. This is known as Side – Side – Side criterion.

● If two sides and the included angle
of a triangle are equal to the corresponding two sides and the included angle of another
triangle, then the two triangles are congruent to each other. This is known as Side
– Angle – Side criterion.

● If two angles and the included side
of one triangle are congruent to the corresponding two
angles and the included side of another triangle, then the triangles are congruent
This is known Angle-Side-Angle criterion.

● In right angled triangle, the side
which is opposite to right angle is the largest side called
Hypotenuse.

● If the hypotenuse and one side of a
right angled triangle is equal to the hypotenuse and one side of another
right angled triangle then the two right angled triangles are congruent. This is
known as Right Angle-Hypotenuse Side criterion.

** **

__ICT Corner__

**Step-1 : **Open
the Browser type the URL Link given below (or) Scan the QR Code. GeoGebra work sheet
named “Geometry” will open. There are three activities named “Angle sum property”,
“Similar triangle” and “Congruence triangle”

**Step-2 :** 1.
In Angle sum Property Drag the vertices A,B and C to change the shape of the triangle
and check the Angle sum Property. 2. In the Similar triangles change the shape and
move the red triangle by holding Diamond point, over Blue triangle to match each
of three angles. 3. In Congruence triangle match the triangles by moving the Blue
triangle by dragging P (and rotating using the slider).

**Browse in the link**

Geometry
: https://www.geogebra.org/m/f4w7csup#material/gqagexmx
or Scan the QR Code.

Tags : Geometry | Term 2 Chapter 4 | 7th Maths , 7th Maths : Term 2 Unit 4 : Geometry

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7th Maths : Term 2 Unit 4 : Geometry : Summary | Geometry | Term 2 Chapter 4 | 7th Maths

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