Angles in Structures

Print the page and read the directions with your child: Write acute, right, or obtuse for each lettered angle. Then circle the angle size that is closest to each one. When they finish, check the work together with the answer key.

A note explains right, acute and obtuse angles. Four structures, a bridge truss, a house roof, a tower crane and a wall frame with a brace, have eight lettered angles. Children write acute, right or obtuse for each and circle the closest angle size from three choices, such as 30°, 60° or 120°. The directions on the page read: Write acute, right, or obtuse for each lettered angle. Then circle the angle size that is closest to each one. An answer key is included.

Yes, both. We made it for 4th Grade geometry, and the page works the same whether it lands on a kitchen table or a center rotation. At home, most families go through it together and talk the answers out loud, and that talking is where most of the learning happens with classify angles. In class it runs well as independent work while you pull a small group. Print one copy or thirty, whichever the day needs.

Hold the corner of a sheet of paper against it. A right angle matches the square corner exactly; an acute angle fits inside it and an obtuse angle opens wider.

Yes. Both sheets have an answer key.

2 printable worksheets, all free to preview. Downloads are included with a ClassWeekly free trial, and every page prints on standard 8.5 x 11 paper.

These are written for 4th Grade students, roughly ages 9-10. Many teachers also use them a grade up for review or a grade down as an extension, so use the preview to judge the fit for a particular child.

Yes. Each one shows the Common Core code it covers on its own page, so you can check the alignment yourself rather than taking our word for it.