      #### 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
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