Calculate the Missing Angle! Use triangle angle sums to reveal the secret message!

Ready to become an angle detective? In this Calculate the Missing Angle! playsheet you’ll use the triangle angle-sum rule — that the three interior angles always add to 180° — to solve puzzles and uncover a hidden message. Every triangle you crack gives you a letter or number that brings the secret closer to light.

You’ll practice neat calculations and logical thinking as you find unknown angles from two given measures, work with isosceles and right triangles, and check your answers. As you solve each problem, your ability to spot patterns and follow steps grows stronger — the same skills you use in math and real-life problem solving.

Pay attention to clues in each question: some triangles hide extra hints like marked equal angles or small diagrams that make solving faster. Observing carefully and using the angle-sum rule will help you move quickly and confidently through the challenge. You’ll love the “aha!” moment when numbers fall into place.