## Shape and Properties of Shape Terms

**Arc:**A part of the circumference of a circle.

**Chord:**A straight line joining any two points on the circumference of a circle.

**Circle:**A shape bounded by a continuous line which is always the same distance from the centre.

**Circumference:**The distance around the outer edge of a circle.

**Cube:**A solid shape with six square faces which are all equal in size.

**Diameter:**A chord that passes through the centre of a circle.

**Equilateral triangle:**A triangle that has three equal sides and three equal angles.

**Hypotenuse:**The longest side in a right-angled triangle. The hypotenuse is always opposite the right angle.

**Isosceles triangle:**A triangle that has two equal sides and two equal angles.

**Line segment:**A part of a straight line.

**Parallelogram:**A four-sided shape whose opposite sides are equal and parallel.

**Perpendicular:**At right angles.

**Pythagoras’ theorem:**In any right angled triangle, the area of the square on the hypotenuse is equal to the sum of the areas of the squares on the other two sides.

**Radius:**The distance from the centre of a circle to any point on its circumference. Half the length of the diameter.

**Right angled triangle:**A triangle that has an interior angle of 90°.

**Scalene triangle:**A triangle where no two sides or angles are equal in measure.

**Sector:**A part of a circle enclosed by an arc and two radii.

**Segment:**A part of a circle cut off by a chord.

**Tangent:**A straight line that touches a circle at one point only.

**Triangle:**A polygon with 3 angles and 3 sides.

**Vertical:**At right angles to the horizon.

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