Find the perimeter and area of a rectangle of cardboard measuring 12.9 cm by 6.4 cm Perimeter: \( \square \mathrm{cm} \) Area: \( \square \mathrm{cm}^{2} \)

5. List TwO properties of each of the following: a) A Parallelogram b) A Rhombus c) A Rectangle d) A Trapezoid

จงหาปริมาตรของพีระมิดฐานสี่เหลี่ยมจัตุรัสซึ่งมีด้านยาวด้านละ 30 เซนติเมตร และมีความสูงเอียง 25 เซนติเมตร

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 \( A E \).

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. \( L L=\sqrt{3} \)

What is the missing reason in step 3?Statements:1. m∠ TRV=60° m∠ TRS=(4x)^circ 2. ∠ TRS and ∠ TRV are a linear pair 3. m∠ TRS+m∠ TRV=180 4. 60+4x=180 5. 4x=120 6. x=30Reasons:1. given 2. definition of linear pair 3.? 4.substitution property of equality 5.subtraction property of equality 6. division property of equality substitution property of equalityangle addition postulatesubtraction property of equalityaddition property of equality