## Todas as tarefas

#### Relações entre as razões trigonométricas 1

A fórmula fundamental da trigonometria é : $\sin^2 \alpha + \cos^2 \alpha = 1$ e a relação entre o seno, o cosseno e a tangente de um ângulo é $\tan \alpha= \frac { \sin \alpha}{ \cos \alpha}$. Determina a tangente de $\alpha$, sabendo que o $\sin \alpha = \frac{1}{5}$ e que $\alpha \in [ 0, ~\frac{\pi}{2}]$. Seleciona a opção verdadeira.

# Trigonometry

Training
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

#### Calculate abscissa with Pythagorean Theorem

Calculate the exact value of abscissa of point $\ {A}$.

# Pythagorean theorem

Learning
8

#### Lake modeling

In a lake, there are p fish. For each fish there are 20 fish eggs. Among the 20 fish eggs, just 7 hatch for each fish. Can you tell how many fish will be in the lake once the eggs hatch?

# Terms with variables

Modeling
7

#### Supportive task for "From natural to algebraic language"

How can we express with symbols an even and an odd number respectively?

# Natural numbers

Training
8