## All Tasks

#### Exact Value: Angle Theorems

The image shows two parallel straight lines intersected by a third one. Determine the size of angle $\beta$ and enter the exact value (without °) in the answer field below.

# Angles

Training

7

#### Juio Le Parc Serie 48 - 1970

In this series, the Argentinian Op'Art artist Juli Le Parc, uses his famous 14 color palette to let mathematics mix them in a fixed but rather randomly looking way. Let's investigate what is happening there!

# Sequences

Modeling

5

#### 3D Pythagoras

Find out the distance, in $ cm$, between point $A$ and $ G$.
Give your answer with one decimal place.

# Pythagorean theorem

Training

8

#### [MOOC]Redução ao primeiro quadrante e fórmulas trigonométricas

Seja $\alpha \in \left [ \frac{\pi }{2}, \frac{3\pi }{2} \right ]$, tal que $sen\alpha =\frac{\sqrt{5}}{5}$
Determina o valor de $tg\left ( \pi +\alpha \right )\times cos\left ( \frac{11\pi }{2}+\alpha \right )+sen\left ( -\frac{\pi }{2}-\alpha \right )$. Apresenta o resultado arredondado às centésimas.

# Trigonometric functions

Reasoning

11

#### Right Triangle

Calculate the missing value.

# Pythagorean theorem

Learning

8

#### Finding out the hypotenuse

Calculate the exact value of the missing value.
Select the true statements.

# Pythagorean theorem

Training

8