Trapezium

A trapezium is a quadrilateral in which one pair of opposite sides is parallel.

A quadrilateral is a four-sided two-dimensional shape. Examples: square, rectangle, rhombus, trapezium, parallelogram and kite.

Triangle on the other hand has three sides and three angles also known as trigon. The root word "tri" means "three" and the root word "quad" means "four". Hence, a triangle is not a quadrilateral.

A line of symmetry is a line that cuts a shape exactly in half.

This means that if you were to fold the shape along the line, both halves would match exactly. Equally, if you were to place a mirror along the line, the shape would remain unchanged.

The shape which it is not possible to divide into equal halves is the answer

Kite

Isosceles Triangle

Trapezium

Isosceles Trapezium

Rhombus

Trapezium has no symmetry except isosceles trapezium but since the question didn't specify that the trapezium is isosceles, then the answer is Trapezium

Concept

Side C is always the side opposite to the right angle □

⇒ 5²+t² = 13²

25+t² = 169

t² = 169 - 25

t² = 144

Take the square root of both sides to get rid of the power 2

√t² = √144

t = 12

NOTE: The result of a square root is simply the number when multiplied by itself will give the number you are calculating the square root of

Thus √144 = 12 since 12 x 12 gives 144