Lesson 6 of 17
Two sides, the angle between
Show on a big screenTwo roads leave a junction, a place where roads meet. A straight footpath joins them.
Step 1 of 4
- The first side, L to R.
- Open the corner at L to the size given.
- Step the second length along that arm.
- Join the end back to R.
A second method
Rule the first side, L to R. Draw the corner at L to the size given. Mark the second length along the new arm. Call the end D. Join D to R.
Two lengths and the angle between them decide the third side. You never chose it, so measure it.
Example: sides 6 cm and 3 cm, with a 50° corner between. One triangle fits.
Watch out!
The corner must sit between the two lengths. Take a 60 mm side with a 40° corner at one end. A 45 mm side sits across from that corner. Two triangles fit.
Slide the corner. Flip the switch to move the corner. Watch the third side.
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Try the lab to finish this lesson.