Hello my wonderful Grade 5 superstar! 👋
I'm Kashef and today we're learning how to find Missing Side Lengths when we know the perimeter of a polygon! If we know the total distance around and all but one side, we can figure out the mystery side. It's like a detective puzzle! Ready to solve some missing sides? Let’s go! 🚀
🧠 The Magic Rule
Missing Side = Total Perimeter − Sum of Known Sides
Known sides: 8 cm, 8 cm, 10 cm
Missing side = 36 − (8 + 8 + 10) = 10 cm
🎯 Let’s Find the Missing Sides!
1. A rectangle has perimeter 42 cm. Two sides are 12 cm each. What is the other side?
2. This triangle has perimeter 27 cm. Two sides are 9 cm and 10 cm. What is the missing side?
3. A square has perimeter 52 cm. What is the length of each side?
🌍 Missing Sides in Real Life
🧱 Building a fence when you know total length
🖼️ Buying ribbon for a picture frame
🏠 Planning a garden border
🎁 Wrapping a gift when you know total ribbon needed
🧪 Quick Missing Side Quiz
Question: A rectangle has perimeter 48 cm. Two lengths are 14 cm each. What is each width?
You are a Missing Side Detective! 🎉🥳
Kashef is super proud of you! You can now find missing sides and calculate perimeters perfectly.
This skill helps with real projects like building, crafting, and planning — you're thinking like a mathematician!