He may want to form a corner of 90 degrees using complementary angles
To use a carpenter's bevel to measure and transfer angles in woodworking projects, first adjust the bevel to the desired angle by loosening the wing nut and moving the blade. Place the bevel against the angle to be measured and lock it in place. Then, transfer the angle by tracing along the edge of the bevel onto the workpiece. This helps ensure accurate angles for cutting and assembling wood pieces in your project.
Carpenters use geometry in order to calculate angles. Most furniture has the shape of basic geometric shapes that must be even in order to support a consumers weights and frame.
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The acute angles would be 35.
hammer
"A carpenter was called to fix the wooden porch."
A carpenter won't usually have much use for exponents, or other advanced math topics.
yes
to hold it
yes
He needs to know lengths and angles and that requires math. Often he needs things like midpoints too.
A tri square is a carpenter's tool that is used to check and mark right angles during construction work.