Explanation:

Straight angle:

• This refers to an angle of 180o. This is also called as angle of a straight line.

Additional InformationReflex angle:

• It is angle which is more than 180o.

Acute angle:

• If an angle which is less than 90o is called an acute angle.

Right angle:

• Angle between a reference line and a perpendicular line is called right angle.

Complementary angles:

• When you have two angles that, when added toger, result in a right angle (90 degrees), y are called complementary angles.

Explanation:

Quadrant:

• Part of a circle with radii making 90o with each or is a quadrant (one fourth of circle).

Additional Information

Circle:

• Circle is a plane figure bound by a curve, formed by locus of a point which moves so that it is always at a fixed distance from a stationary point "Centre".

Diameter:

• The length of a straight line between two points on curve, passing through centre is called "Diameter", D: Dia or d. It is twice radius.

Sector:

• It is part of a circle bounded by two radii (plural of radius) meeting at an angle and an arc.

Circumference:

• It is linear length of entire curve, equal to π D

Arc:

• A part of circle between any two points on circumference or periphery is called an 'Arc'.

Chord:

• A straight line joining ends of an arc is called chord. (Longest chord of circle is diameter)

Radius:

• The distance from centre to any point on circle is called "Radius".

Segment:

• A part of circle or area bound by arc and chord is segment of circle.

When a plane is perpendicular to one of reference planes and inclined to or, its inclination is shown by an angle which its projection on plane to which it is perpendicular, makes with xy. Its projection on plane to which it is inclined is smaller than plane itself.

Given square is parallel to vertical plane ad diagonal is making 45 degrees with xy reference plane top view and side gives a line and both of same length which is equal to length of side of square because in square angle between diagonal and side is 45 degrees.

When a plane is parallel to a reference plane, it has no trace on that plane. Its trace on or reference plane, to which earlier reference plane is perpendicular, is parallel to xy reference line.

As initially plane is assumed to be parallel to V.P top view will be line and n plane is tilted with respect to V.P to required angle top view (line makes angle with V.P) remains line. Finally plane is tilted with respect to H.P n parallelogram will form in top view.

If a square is parallel to one of reference plane projection parallel to plane gives true shape and size as here plane is inclined so square transformed to rectangle and furr it turned inclined in or way which gives parallelogram shape for square.

Given a triangle parallel to horizontal plane so front view and side view gives a line and top view gives true shape and size of triangle so top view should be drawn first with specifications given and n projections to furr gives front view.

Explanation:

Radius:

• The distance from centre to any point on circle is called "Radius".

Additional Information

Circle:

• Circle is a plane figure bound by a curve, formed by locus of a point which moves so that it is always at a fixed distance from a stationary point "Centre".

Diameter:

• The length of a straight line between two points on curve, passing through centre is called "Diameter", D: Dia or d. It is twice radius.

Sector:

• It is part of a circle bounded by two radii (plural of radius) meeting at an angle and an arc.

Circumference:

• It is linear length of entire curve, equal to π D

Arc:

• A part of circle between any two points on circumference or periphery is called an 'Arc'.

Chord:

• A straight line joining ends of an arc is called chord. (Longest chord of circle is diameter)

Segment:

• A part of circle or area bound by arc and chord is segment of circle.

Quadrant:

• Part of a circle with radii making 90o with each or is a quadrant (one fourth of circle).

If a square is parallel to one of reference plane projection parallel to plane gives true shape and size as here plane is inclined so square transformed to rectangle and furr it turned parallel to observer so no change in shape and size.