Maths

• The equation to find the area of a circle is : π x radius²
• The equation to find the circumference of a circle is either : π x diameter or π x 2 x diameter
• Parts of a circle

  
• The Pythagoras equation is : a²+b²=c²
• interior angles + exterior angles = 180°
• Total interior angles = 180(n-2)
• Equation on how to find the exterior angle of a polygon is: 360/number of sides
• The equation on how to find the area of a fraction of a circle: πr²/4
• The equation on how to find the perimeter of a fraction of a circle: (2πr/4)+r+r
• The equation on how to find the arc length: 2 x π x r x (θ/360)
• The equation on how to find the interior angle: 180 - exterior angle or Total interior ÷ the number of sides
• The equation on how to find the exterior angle: 360/the number of sides
• The equation on how to find the total interior angle: 180 x (number of sides - 2)
• What is the equation on how to find the total interior angle?


  180 x (number of sides-2)
• 1. Shortwave radiation from the sun travels towards Earth
  2. Some reaches Earth and is absorbed by ocean and land.
  3. Some radiation is trapped by greenhouse gases and keeps the Earth warm
  4. Some heat passes through the atmosphere as longwave radiation into space

  A) 1.

  B) 2.

  C) 3.

  D) 4.