:
Each option: 0.5 Marks
(a) $\angle$ ABD
(b) $\angle$ RTS
(c) $\angle$ ACD and $\angle$ ACB
(d) $\angle$ RTW and $\angle$ RTS
(e) $\angle$ AED, $\angle$ AEB, $\angle$ BEC and $\angle$ DEC
(f) $\angle$ AEC
(g) $\angle$ ACD
(h) $\angle$ AKO, $\angle$ AKP, $\angle$ BKO, $\angle$ BKP

:
Each option: 1 Mark
(a) CP and AB are two chords of the circle.
(b) OP, OC, OA and OB are all radii of the circle.
(c) CP is a chord of the circle, which is not a diameter.
(d)

:
Angles: 1 Mark
Sides: 1 Mark
Diagonals: 1 Mark

In the given figure the opposite angles are (∠DAB,∠BCD)& (∠ADC, ∠ABC).
The side DA is opposite to BC, and the side CD is opposite to AB.
AC and BD are the diagonals.

:
An angleis made up of two rays having a common endpoint.
The two rays forming the angle are called 'sides' or 'arms' of the angle, and the common endpoint is called the 'vertex' of the angle.

:
Each option: 1 Mark
a) In the above figure, the three triangles are
$\Delta ABC,\Delta ABD,and\Delta ADC$.
b) The seven angles are
$\angle ABC\angle BAC\angle ACB\angle ADB\angle ADC\angle BAD\angle CAD$
c) The six line segments are:
$\overline{AB},\overline{BD},\overline{DC},\overline{AC},\overline{BC},\overline{AD}$
d) The triangles which have $\angle B$ as common are,
$\Delta ABCand\Delta ABD$.

:
Definition: 1 Mark
Explanation: 1 Mark
Example: 1 Mark

A quadrilateral is a type of polygon. It has four sides.
Quadrilateral means "four sides"(quadmeans four,lateralmeans side).
It is a 2-dimensionalclosedshape and hasstraightsides.
In the quadrilateral, ABCD, here (AB, BC), (BC, CD), (CD, DA) and (DA, AB) are the adjacent side whereas (AB, CD) and (AD, BC) are the opposite sides.
The four angles are $\angle$ABC,$\angle$BCD,$\angle$CDA,$\angle$DAB.

Answer: Option B. -> Radii-OA,OC,OB ; Chord-BC ; Diameter-AB ; Centre-O
:
B

From the above figure we can find
Radii :-$OA,OC$ and $OB$ ;
Chord :-$BC$ ;
Diameter :-$AB$ and
Centre :- $O$

Answer: Option C. -> on, inside, outside
:
C

Point A lies on the curve.
Point B lies inside the curve.
Point C lies outside the curve.

:
Line segment: 1 Mark
Ray: 1 Mark
Number of Lines segments: 1 Mark
In a line segment, the endpoints are fixed i.e. a line is contained between two points.
A ray is a portion of a line. It starts at one point and goes endlessly in one direction.
The line segments in the above figure are:
AB,AC,AD,AE,BC,BD,BE,CD,CE,DE.
Hence there 10 lines segments in the above figure.

:
Definition: 1 Mark
Solution: 1 Mark
A line segment is a piece,or part, of a line in geometry.
A line segment is representedby endpoints on each end of the line segment.
A line in geometry is represented by a line with arrows at each end.
A line segment and a line are different because a line goes on forever while a line segment has a distinct beginningand end.