If you're seeing this message, it means we're having trouble loading external resources on our website.

Dacă sunteţi în spatele unui filtru de web, vă rugăm să vă asiguraţi că domeniile *. kastatic.org şi *. kasandbox.org sunt deblocate.

Conţinutul principal

## Geometrie pentru EN

### Unitatea 6: Lecția 1

Tipuri de patrulatere

# Unghiuri drepte în figuri (definiție informală)

Identificăm unghiuri drepte din figuri.

## Introducere

Multe figuri au coțuri. Un colț îl numim unghi drept dacă putem potrivi perfect în interiorul lui un mic pătrat.

### Se consideră trapezul

A trapezoid. The direction of each side is as follows, beginning at the top and continuing in a clockwise pattern: straight line to the right, straight line down and left, straight line to the left, straight line up.
Hai să desenăm câte un pătrat în fiecare colț.
A trapezoid with a square in each corner. The direction of each side is as follows, beginning at the top and continuing in a clockwise pattern: straight line to the right, straight line down and left, straight line to the left, straight line up.
În care colțuri se potrivește perfect un mic pătrat?
A trapezoid with a square in each corner. There are 2 green squares in the upper and lower left corners. There are 2 red squares in the upper and lower right corners. Each green square is labeled right angle and each red square is labeled not a right angle. The direction of each side is as follows, beginning at the top and continuing in a clockwise pattern: straight line to the right, straight line down and left, straight line to the left, straight line up.
Trapezul are două unghiuri drepte.

## Antrenament

Mai întâi, să analizăm mai multe exemple.
A rectangle with a square in each corner. The direction of each side is as follows, beginning at the top and continuing in a clockwise pattern: straight line to the right, straight line down, straight line to the left, straight line up.
A quadrilateral with a square in one corner. The direction of each side is as follows, beginning at the top and continuing in a clockwise pattern: straight line down and right, straight line down and left, straight line up and left, straight line up and right.
A right triangle with a square in one corner. The direction of each side is as follows, beginning at the top and continuing in a clockwise pattern: straight line to the right, straight line down and left, straight line up.
Acum încearcă singur!
Câte unghiuri drepte sunt în acest pătrat?
A square shape with 4 sides. The direction of each side is as follows, beginning at the top and continuing in a clockwise pattern: straight line to the right, straight line down, straight line to the left, straight line up.

Câte unghiuri drepte sunt în acest pentagon?
A pentagon shape with 5 sides. The direction of each side is as follows, beginning at the top and continuing in a clockwise pattern: straight line to the right, straight line down and right, straight line down and left, straight line to the left, straight line up.

## Problemă provocare

Câte unghiuri drepte are această figură?
A shape with 9 sides. The direction of each side is as follows, beginning at the top and continuing in a clockwise pattern: straight line to the right, straight line down and right, straight line to the right, straight line down and left, straight line down and right, straight line down and left, straight line to the left, straight line up, straight line up and right.