Question

You says on the picture

Answer 1

Pythagoras Theorem:


`\boxed {\boxed {a^2 + b^2 = c^2}}`

Apply Pythagoras Theorem:

`5.2^2 + b^2 = 7^2`

Take away 5.2² from both sides:

`b^2 = 7^2 - 5.2^2`

Evaluate the Right Hand Side:

`b^2 = 21.96`

Square root both sides:

`b = √(21.96)`

Evaluate the Right Hand Side:

`b = 4.7`


`\boxed{\boxed{\text{Answer = 4.7 mm}}}`

Answer 2

Use the Pythagorean Theorem. a^2+ b^2=c^2.
In this case, it is c^2-b^2=a^2, so your answer is 4.686 mm^2. Round if you need to.