Question

PLEASE HELP!
Tinh has a triangle with side lengths 12 mm, 15 mm, and 18 mm. He wants to reduce the triangle by one-third, so he divides each side length and each angle measure by 3. Which describes Tinh’s reduction?
Tinh’s reduction is incorrect; he should have only divided the side lengths by 3.
Tinh’s reduction is incorrect; he should have only divided the angle measures by 3.
Tinh’s reduction is incorrect; he should have multiplied the side lengths by 3 instead.
Tinh’s reduction is incorrect; he should have multiplied the angle measures by 3 instead.

Answer 1

$\huge{\underline{\underline{\tt{\red{answer}}}}}$

$\small{\underline{\underline{\tt{\blue{12 - \frac{1}{3} = \frac{36 - 1}{3} = \frac{35}{3} = 11.6mm }}}}}$

$\small{\underline{\underline{\tt{\blue{15- \frac{1}{3} = \frac{45 - 1}{3} = \frac{44}{3} = 14.6mm }}}}}$

$\small{\underline{\underline{\tt{\blue{18- \frac{1}{3} = \frac{54 - 1}{3} = \frac{53}{3} = 17.3mm }}}}}$

$\large{\underline{\underline{\bf{\purple{new \: \: sides \: \: are \: \: }}}}} \\ \\ \small{\underline{\underline{\bf{\purple{11.6mm \: \: 14.6mm \: \: \: and 17.3mm}}}}}$