Risolvi i seguenti problemi sul perimetro dei triangoli 42. Calcola il perimetro di un triangolo che ha i lati di \( 0,7 \mathrm{dm}, 5,6 \mathrm{~cm} \) e 83 mm . \( [20,9 \mathrm{~cm}] \)

In the pentagon \( A B C D E \) angle \( A C B= \) angle \( A E D=90^{\circ} \). Triangle \( A C D \) is equilateral with side length 12 cm . \( D E=B C=6 \) a. Calculate \( A E \).

จงหาปริมาตรของพีระมิดฐานสี่เหลี่ยมจัตุรัสซึ่งมีด้านยาวด้านละ 30 เซนติเมตร และมีความสูงเอียง 25 เซนติเมตร

BLos estudiantes de 9 dibujaron un mural como el de la figura. Damyor \( =8 \mathrm{~m} \) y dmonor \( =2 \pi \mathrm{~m} \) ¿cuál es el área rayada de la figura?

3. Sketch and name a quadrilateral that fits each description. Make sure to label all equal sides and angles. a) The diagonals are equal, but the sides are not all equal. b) The diagonals are equal and all the sides are equal. c) The diagonals are not equal and no two sides are equal.

3] The dimensions of the base of a cuboid are \( \sqrt{3} \mathrm{~cm} \). and \( (\sqrt{3}-1) \mathrm{cm} \). an ts height equals \( (3+\sqrt{3}) \mathrm{cm} \). Calculate its volume. \( L L=\sqrt{3} \)