2.5 Geometry

• Perpendicular lines intersect at a 90-degree angle.


  True
• What defines a square as a quadrilateral?

  4 equal sides, right angles
• A right angle measures exactly 90 degrees.
• What is the measure of a right angle in degrees?

  90 degrees
• What type of triangle has all three sides equal?

  Equilateral
• What are the properties of a square?

  4 equal sides, 4 right angles
• What is the formula for the circumference of a circle?

  $2 \times \pi \times r$
• Order the types of angles from smallest to largest:

  1️⃣ Acute

  2️⃣ Right

  3️⃣ Obtuse

  4️⃣ Reflex
• A vertical line is parallel to the y-axis.


  True
• The diameter of a circle is twice its radius.


  True
• A triangle with all sides equal is called equilateral
• Parallel lines intersect at a right angle.

  False
• The diameter of a circle is twice its radius.


  True
• If two lines are horizontal and vertical, they are perpendicular and intersect at a right angle.


  True
• The sum of the angles in a triangle is always 180
• In an equilateral triangle, all 3 angles are 60 degrees.

  True
• Classify the following triangles by their side lengths:

  1️⃣ Scalene

  2️⃣ Isosceles

  3️⃣ Equilateral
• Match the quadrilateral with its definition:

  Parallelogram ↔️ Opposite sides parallel and equal

  Trapezium ↔️ 1 pair of parallel sides
• Perpendicular lines intersect at a 90-degree angle.

  True
• What is a horizontal line parallel to?

  x-axis
• Match the type of angle with its degree measure:

  Acute ↔️ Less than 90 degrees

  Obtuse ↔️ Greater than 90 degrees

  Right ↔️ Exactly 90 degrees

  Reflex ↔️ Greater than 180 degrees
• Which quadrilateral has only one pair of parallel sides?

  Trapezium
• The circumference of a circle is calculated using the formula 2 x π x radius.

  True
• A triangle with exactly two equal sides is called isosceles
• A rectangle has opposite sides equal and right angles.
• Parallel lines are equidistant at all points.


  True
• A right angle is exactly 90 degrees.
• What is the measure of an acute angle?

  Less than 90 degrees
• What are the properties of a square?

  4 equal sides, 4 right angles
• What is the definition of an isosceles triangle?

  Two sides equal
• An angle less than 90 degrees is called acute
• Lines parallel to the x-axis are called horizontal
• The sum of the angles in a triangle is always 180
• In a scalene triangle, all three angles are equal.

  False
• The sum of the 3 angles in a triangle is always 180 degrees.
• The sum of the 4 angles in a quadrilateral is always 360 degrees.
• Parallel lines are equidistant at all points and never intersect.
• A right angle measures exactly 90 degrees.


  True
• What defines an equilateral triangle in terms of its sides?

  All 3 sides are equal
• Horizontal lines are parallel to the y-axis.

  False