Answer:
(for the two triangles in the middle of the page)
c=5 and z=8
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Explanation:
using pythagoreas theorem
alt^2+base^2=hypotenuse^2
similarly
in triangle 1)
4^2=3^2=c^2
16+9=25
=>5(sqaure root of 25)
in triangle 2)
6^2+x^2=10^2
x^2=10^2-6^2
x^2=100-36
x^2=64
=>x=8
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for the third question(diagonal of park)
similar formula is used
20^2+21^2=hypotenuse or diagonal length of park
400+441=841
root 841= 29