Interestingly though, you’ve got a 3:4:5 triangle, multiplied by length of 5 This is a red flag. our sub-striangles (ACD and ABD) are also 3:4:5 triangles, ACD is a 3:4:5 triangle x3 – with AC being 5*3 and CD being 4*3 and AD 3*3
ABD is a 3:4:5 triange x 4 – with CB being 5*4 and CD being 3*4 and BD 4*4 AB = AD + BD add up to 25 (which is the root of 15²+20²)
AC = 15
CD = 20 and the angles are correct. Answer: 12

Interestingly though, you’ve got a 3:4:5 triangle, multiplied by length of 5

This is a red flag.

our sub-striangles (ACD and ABD) are also 3:4:5 triangles,

ACD is a 3:4:5 triangle x3 – with AC being 5*3 and CD being 4*3 and AD 3*3

ABD is a 3:4:5 triange x 4 – with CB being 5*4 and CD being 3*4 and BD 4*4

AB = AD + BD add up to 25 (which is the root of 15²+20²)

AC = 15

CD = 20

and the angles are correct.

Answer: 12

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