CPhill

WX * YZ = 2 * 3  = 6 

https://web2.0calc.com/questions/pascal-s-triangle_25

https://web2.0calc.com/questions/rates_51

2.   H is the  orthocenter of the triangle  Draw CH  and extend it  to F where CF is the third altitude of the  triangle

Angle AHE  =  180   - 128 =  52

Angle AEH  = 90

Angle HAE  =  90  - 52 = 38

Angle BAH  =  28

Angle BAC =  Angle BAH + Angle HAE  =  28 + 38  = 66 

Angle CFA =  90

Angle BAC =  66

Angle FCA =  180 - 90 - 66   = 24

But Angle FCA = Angle HCA =  24

https://web2.0calc.com/questions/help-coordinates_136

11111          

1112   1121  1211  2111

122      212    221

113      131    311

 23         32

https://web2.0calc.com/questions/help-with-coordinates_36

Here's a very similar problem answered by hectictar

https://web2.0calc.com/questions/help-asap-tysm_1

https://web2.0calc.com/questions/circles_147

https://web2.0calc.com/questions/semicircle_6