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Conţinutul principal

Bazele geometriei

Curs: Bazele geometriei > Unitatea 3

Lecția 3: Patrulatere
Matematică
Bazele geometriei
Figuri
Patrulatere
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Unghiuri drepte în figuri (definiție informală)

Clasa Google
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.
  • Your answer should be
  • un întreg, precum 6
  • o fracție subunitară ireductibilă, precum 3, slash, 5
  • o fracție supraunitară simplificată, precum 7, slash, 4
  • un număr compus, precum 1, space, 3, slash, 4
  • un număr zecimal exact, precum 0, comma, 75
  • un multiplu al lui pi, precum 12, space, start text, p, i, end text sau 2, slash, 3, space, start text, p, i, end text

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.
  • Your answer should be
  • un întreg, precum 6
  • o fracție subunitară ireductibilă, precum 3, slash, 5
  • o fracție supraunitară simplificată, precum 7, slash, 4
  • un număr compus, precum 1, space, 3, slash, 4
  • un număr zecimal exact, precum 0, comma, 75
  • un multiplu al lui pi, precum 12, space, start text, p, i, end text sau 2, slash, 3, space, start text, p, i, end text

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.
  • Your answer should be
  • un întreg, precum 6
  • o fracție subunitară ireductibilă, precum 3, slash, 5
  • o fracție supraunitară simplificată, precum 7, slash, 4
  • un număr compus, precum 1, space, 3, slash, 4
  • un număr zecimal exact, precum 0, comma, 75
  • un multiplu al lui pi, precum 12, space, start text, p, i, end text sau 2, slash, 3, space, start text, p, i, end text