Question

Give definition for each of the following terms are there other terms that need to define first ? What are they and you define them ?
1. Perpendicular lines
2. Radius
3.Square​

Answer 1

Answer:

1. perpendicular lines are those that make a angle of 90°
2. radius is half of diameter that means it is the distance from the center to the boundary
3. square is a figure having four boundaries each making 90° angle and has all sides equal

Answer 2

$\huge{\pink{\green {\sf\boxed{EXPLANATION\: ON \:GIVEN \:TOPICS }}}}$

$\bold{\underline {1.Perpendicular\: lines:}}$ Two lines are perpendicular in a plane if the angle between the two lines is 90°.

The perpendicular lines are coplanar, so plane must be mentioned before defining perpendicular lines.

$\bold{\underline {2.Radius:}}$

a circle is the collection of those points in a plane which are at constant distance ${r}$from a fixed point C.

• See attached picture of circle.

Here, constant distance ${CP = r}$is called radius.

So, plane must be mentioned in defining the radius.

$\bold{\underline {3.Square:}}$A square is rectangle having all equal sides.

• See attached picture of square.

Let ${ABCD}$ is a quadrilateral where AB = BC = CD = DA and ∠A = ∠B = ∠C = ∠D = 90°.

∴ Quadrilateral ABCD is a square and also a rectangle having consecutive sides AB and BC are of equal length.

So, in defining a square, rectangle must be mentioned.

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