Calculate the surface areas of the triangles show your solution pls

[tex]\LARGE\bold\red{\tt{\:\:\:\:\:Area\:of\:a\:Triangle}}[/tex]
Formula: [tex] \large \tt A= \frac{1}{2}bh [/tex]
1. Given: b= 6cm, h= 9cm
Solution:
[tex] \large \tt A= \frac{1}{2}bh \\ \\ \large \tt A= \frac{1}{2}(6cm)(9cm) \\ \\ \large \tt A= \frac{1}{2}(54c {m}^{2} ) \\ \\ \large \red{ \boxed{ \tt {A= 27c {m}^{2} }}}[/tex]
2. Given: b= 5in, h= 8in
Solution:
[tex] \large \tt A= \frac{1}{2}bh \\ \\ \large \tt A= \frac{1}{2}(5in)(8in) \\ \\ \large \tt A= \frac{1}{2}(40in ^{2} ) \\ \\ \large \red{ \boxed{ \tt {A=20in ^{2} }}} \\ [/tex]
3. Given: b= 15in, h= 4in
Solution:
[tex] \large \tt A= \frac{1}{2}bh \\ \\ \large \tt A= \frac{1}{2}(15in)(4in) \\ \\ \large \tt A= \frac{1}{2}(60in ^{2} ) \\ \\ \large \red { \boxed{\tt {A= 30in ^{2} }}}[/tex]