Problem 80: Numbers on Triangles 2

See a similar puzzle problem here

Problem 79: Red Circle

Source: @TamasGorbe

Problem 78: Puzzle

Put 32 red circles on the yellow squares.

The number of circles on each row and each column is given. 

One of the red circles is placed to help you.

Problem 77: Semicircles

Find the shaded area.

Source: Eylem Gercek Boss

Problem 76: Rings

Math Pics 7: Beautiful Squaring

Problem 75: Numbers on Triangles

Place the numbers 1 to 9 inside the circles, so that, the sum of the numbers on each small triangle is equal to each other.

Problem 74: Area

Problem 73: How many triangles?

How many triangles can you count?

Rich Tasks 35: Flipped Equations!

1. Solve the following equation for x. Then flip the equation and solve it again.

Resource:@robeastaway

2. Write an equation which gives the same answer when turned upside down.

Resource and detailed solution: Aperiodical

Problem 72: Square and Triangle

A square and an equilateral triangle together have the property that the area of each is the perimeter of the other.

Find the square's area.




Source: The Center of Math

Math Pics 6: Line of Symmetry and Order of Rotational Symmetry

Images are taken from https://christophermarley.com/

Rich Tasks 34: What is this graph about?

Problem 71: Triangle Puzzle

@Matematik_Man

Beautiful Gifs 8: The brachistochrone

via curiosamathematica

Math Pics 5: Desmos Art Project

Sample Student works

https://www.desmos.com/calculator/whmo4uhqne

https://www.desmos.com/calculator/yebqr29oyl

https://www.desmos.com/calculator/uykcqqickd

https://www.desmos.com/calculator/hqkbd0hegi

Rich Tasks 33: Make your own math problem